Make sure that your add_action hook is set to admin_menu.
Here’s a sample code:
add_action('admin_menu', 'wpse149688');
function wpse149688(){
add_menu_page( 'Wholesale Pricing', 'Wholesale', 'manage_options', 'woo-wholesale', 'woo_wholesale_page_call');
add_submenu_page( 'woo-wholesale', 'Registrations', 'Registrations', 'manage_options', 'woo-wholesale-registrations', 'wwpr_page_call' );
}
Also check whether user you’ve logged in as has the ability to view this menu. As this menu is set using manage_options capability.
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